Cryptology ePrint Archive: Report 2018/005

Simple and Efficient Two-Server ORAM

Xiao Wang and Dov Gordon and Jonathan Katz

Abstract: We show a protocol for two-server oblivious RAM (ORAM) that is simpler and more efficient than the best prior work. Our construction combines any tree-based ORAM with an extension of a two-server private information retrieval scheme by Boyle et al., and is able to avoid recursion and thus use only one round of interaction. In addition, our scheme has a very cheap initialization phase, making it well suited for applications to RAM-based secure computation.